Covering for suspended ceiling grid system

ABSTRACT

The invention is a covering for a suspended ceiling grid system, the covering is particularly suited to be retrofitable onto an installed suspended ceiling grid system, the covering is preferably a plastic cap that can be snap fit onto the main runners or cross-tees of the installed suspended ceiling grid system, and the covering is comprised of an elongate body having an opposed flange and lip which facilitate easy assembly and disassembly from a suspended ceiling grid system. The elongate body of the covering may be planar or non-planar. The covering may also have notches defined in the flange and lip in a suitable arrangement.

[0001] This application is a continuation-in-part application of application Ser. No. 09/591,750 filed Jun. 12, 2000, which is a continuation-in-part of application Ser. No. 09/385,157 filed Aug. 30, 1999.

FIELD OF THE INVENTION

[0002] The invention relates to a covering for a suspended ceiling grid system, and more particularly, to a cap to retrofit onto an existing suspended ceiling grid system.

BACKGROUND OF THE INVENTION

[0003] Ceiling grid systems for supporting tile panels, such as acoustical ceiling tiles, are used extensively in both new and remodeled building and room structures. Grid systems typically consist of main runners and cross-tees, having lateral supporting shoulders, that are arranged perpendicular to each other to form a rectangular pattern. After the grid is installed, the tile panels are placed onto the supporting shoulders of the runners and cross-tees. Such a grid system offers many advantages such as increasing a room's energy efficiency, improving a room's acoustics, enhancing the aesthetic value of a room, providing a means for lowering a ceiling, and allowing for the installation of electrical fixtures, pipes and duct work.

[0004] Ceiling grid systems are relatively inexpensive and easy to install as compared to a plaster ceiling. As a consequence, there is a continuing need to improve on the design and integrity of grid systems, particularly in light of the fact that many such systems are installed in commercial buildings requiring years of service, or installed by the do-it-yourself home owner.

[0005] In particular, there is a need to extend the life of the ceiling grid system. After a period of use, a suspended ceiling grid system, such as made from metal, may begin to degrade in that the components may start to rust or to flake, chip or peel paint or may be damaged such as by denting. Further, the color of the grid system as seen by a room's occupant may become discolored or faded over time. For example, in a food processing plant, flaking paint from a suspended ceiling grid system may be a safety and/or health hazard. In general, such a degraded ceiling grid system is also not aesthetically pleasing. Typically, such a degraded ceiling grid system had to be either repainted or removed/replaced with a new ceiling grid system, both at a high cost in labor and materials. Repainting may also be a temporary fix in that it is likely the paint will begin to flake or peel again.

[0006] Aesthetically, the color of a suspended ceiling grid system as seen by a room's occupants may also be outdated or there may be a need to change the decor of the room. Typically, suspended ceiling grid systems would have to be either repainted or replaced with the new desired colored ceiling grid system in order to change the color of the ceiling, again both at a high cost in labor and materials.

[0007] Accordingly, there exists a need for a device to cover a suspended ceiling grid system, such as an existing metal ceiling grid system, to change or retroactively change the appearance of the grid system without having to repaint or replace the grid system.

SUMMARY OF THE INVENTION

[0008] The invention provides a covering or cap for a suspended ceiling grid system. The covering is particularly suited to fit or retrofit onto an existing installed suspended ceiling grid system. The covering is preferably a plastic cap that can be snap fit onto the main runners and cross-tees of the grid system. The covering is comprised of an elongate body having a flange and a lip which are opposed and which facilitate easy assembly and disassembly from the suspended ceiling grid system. In a second embodiment of the invention, the elongated body is non-planar and has only a flange. In a third embodiment, the elongate body is non-planar and has both a lip and a flange. In another embodiment, notches are provided in the flange of the covering at locations about one-quarter of the length of the covering in from each end of the covering.

[0009] It is a feature of the present invention to provide a covering for a suspended ceiling grid system.

[0010] It is another feature of the present invention to provide a covering for a suspended ceiling grid system to change the appearance of such a grid system.

[0011] It is another feature of the present invention to provide a covering for an installed ceiling grid system to change the appearance of such a grid system.

[0012] It is another feature of the present invention to provide a covering for an installed metal suspended ceiling grid system to change the appearance of such a grid system.

[0013] It is another feature of the present invention to provide a covering for a suspended ceiling grid system to change the color of the visible portions of the main runners and cross-ties.

[0014] It is another feature of the present invention to provide a covering for a degraded suspended ceiling grid system.

[0015] It is another feature of the present invention to provide a covering for an installed suspended ceiling grid system to eliminate rust, paint or the like from peeling or flaking from the grid system.

[0016] It is another feature of the present invention to provide a covering for an installed suspended ceiling grid system to cover the discolored or faded portion of the system visible to a room's occupant.

[0017] It is another feature of the present invention to provide a covering for a suspended ceiling grid system that is easy to install.

[0018] It is another feature of the present invention to provide a covering for a suspended ceiling grid system that is more cost effective than repainting or replacing the grid system.

[0019] It is another feature of the present invention to provide a covering for an installed suspended ceiling grid which can be snap fit onto the installed grid system.

[0020] It is another feature of the present invention to provide a cap for a suspended ceiling grid system that includes an elongate body having a flange and a lip that engages the grid system.

[0021] It is another feature of the present invention to provide a cap for a suspended ceiling grid system that includes a non-planar elongate body having a flange that engages the grid system.

[0022] It is another feature of the present invention to provide a cap for a suspended ceiling grid system that includes a non-planar elongate body having a flange and a lip that engages the grid system.

[0023] It is another feature of the present invention to provide a covering for a suspended ceiling grid system that is made from an extruded plastic.

[0024] Other features and advantages of the invention will become apparent to those of ordinary skill in the art upon review of the following detailed description, claims, and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0025]FIG. 1 is an end view of a covering for a suspended ceiling grid system embodying the invention;

[0026]FIG. 2 is a top view of the covering;

[0027]FIG. 3 is a cross-sectional end view of a runner of a suspended ceiling grid system;

[0028]FIG. 4 is a cross-sectional end view of the covering partially installed onto the runner of FIG. 3;

[0029]FIG. 5 is a cross-sectional end view of the covering fully installed onto the runner of FIG. 3;

[0030]FIG. 6 is a perspective view of a second embodiment of the covering having a non-planar elongate body and flange;

[0031]FIG. 7 is a perspective view of a third embodiment of the covering having a non-planar elongate body, flange and lip.

[0032]FIG. 8 is a perspective view of an alternative embodiment of the invention.

[0033]FIG. 9 is a cross-sectional view of FIGS. 7 or 8.

[0034]FIG. 10 is an exploded perspective view of coverings including the alternative embodiment of FIG. 8 and the other coverings shown in FIGS. 1-7 arranged for installment onto a grid system.

[0035]FIG. 11 is an exploded perspective view of coverings including the alternative embodiment of FIG. 8 and the other coverings shown in FIGS. 1-8 arranged for installment onto a grid system.

[0036]FIG. 12 is an enlarged view of a portion of FIG. 10.

[0037]FIG. 13 is a view similar to that shown in FIG. 12; and

[0038]FIG. 14 is a view of an alternative embodiment of the invention similar to that shown in FIG. 8.

[0039] Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0040] The subject matter of application Ser. No. 09/591,750 filed Jun. 12, 2000, and the subject matter of continuation-in-part of application Ser. No. 09/385,157 filed Aug. 30, 1999 are both hereby incorporated by reference.

[0041] Referring now to the drawings, there is shown in FIG. 1 a first embodiment of the invention, a covering or cap 10 for a suspended ceiling grid system. The covering 10 includes a central web portion 12 having two edges. A flange 14 is preferably integral with one edge and a lip 16 is preferably integral with the other edge. The flange 14 and the lip 16 are opposed and extend inwardly over the web portion 12 toward one another. The flange 14 cooperates with the web portion 12 to define a channel 18. The channel 18 is configured so as to house a portion of a main runner or a cross-tee as will be more fully explained below. The lip 16 cooperates with the web portion 12 to define a channel 20. The channel 20 is configured so as to house a portion of a main runner or a cross-tee as will be more fully explained below. At this point, it should be noted that the flange 14 and the lip 16 have lengths that extend inwardly over the web portion 12 and toward each other, with such lengths being unequal.

[0042] Preferably, the covering 10 is extruded from a plastic such as PVC. The longitudinal length of the covering 10 can be varied to accommodate varying dimensions of suspended ceiling grid systems or the covering 10 can be provided in bulk coiled form then cut by the installer to fit in a particular installation. Further, the covering 10 can be produced in varying colors to accommodate varying color schemes in the environment into which the covering 10 will be installed.

[0043] Referring now to FIG. 2, the covering 10 preferably includes notches 22 along its longitudinal length. The notches 22 allow perpendicularly adjacent coverings 10 to mate at an intersection of a main runner and a cross-tee, as is conventional in the art.

[0044] Turning now to FIG. 3, a runner 24, such as a main runner or a cross-tee, of a typical suspended ceiling grid system is shown. The runner 24 includes two sheets 26 and 28, typically metal, that are bent or folded to the configuration shown in FIG. 3. The sheet 26 is folded to a generally T-shaped configuration and the sheet 28 is bent around the T-shaped portion 30 of the sheet 26 so as to be generally C-shaped. Conventionally, a bottom face 32 of the sheet 28 had been painted or coated as this would have been the face that was visible to occupants of the room where it will be installed. It is this painting or coating that could degrade with time and flake, peel or rust. The runner 24 includes edges 34 and 36.

[0045] Turning now to the installation of the covering 10 depicted in FIG. 1, and shown and FIG. 4, the edge 34 of the runner 24 is positioned in the channel 18 of the flange 14. Upward pressure is then applied to the covering 10 on the web portion 12 near the lip 16 in the direction of the arrow in FIG. 4 such as by an installer's thumb. The upward pressure deforms the lip 16 enough to allow the covering 10 to snap into its installed position as is shown in FIG. 5 wherein the edge 36 is housed in the channel 20. In its installed position, the covering 10 is securely but removably positioned on the runner 24 by the flange 14 and the lip 16. It should be noted that the ease of installation of the covering 10 onto the runner 24 is particularly advantageous when installing the covering 10 on an existing suspended grid system where the installer is working overhead to install the covering 10. The snap fit covering 10 is both time efficient and installer friendly. If necessary, the covering 10 can be removed from the runner 24 by the application of downward pressure in the direction of the arrow in FIG. 5.

[0046] Turning back to FIG. 1, the flange 14 has a first portion 40 having a first length L1 and a second portion 42 having a second length L2. The lip 16 has a first portion 44 having a third length L3 and a second portion 46 having a length dimension L4. The length dimension LI and L3 of the portions 40 and 44, respectively, are preferably equal so as to accommodate the typically uniform height dimension of the edges 34 and 36 of the runner 24. However, and as noted above, the length dimension L2 and L4 of the portions 42 and 46, respectively, are not equal. This is to enable the releasable snap fit action of the covering 10 onto the runner 24.

[0047] More specifically, the length dimension L4 of the first portion 44 of the lip 16 must enable the releasable snap fit action for ease of installation of the covering 10. The length dimension L4 is chosen so that the first portion 42 of the lip 16 is able to travel upwardly in the direction of the arrow in FIG. 4 and outwardly in a direction away from the web portion 12 thus allowing the lip 16 to travel around the edge 36. The lip then deforms or snaps back to its original non-deformed position when it has cleared the edge 36 to result in the edge 36 being housed in the channel 20.

[0048] An advantage of the covering 10 being preferably manufactured of a plastic is that health and safety regulations may be more easily met as opposed to repainting a degraded grid system.

[0049] Although particularly suited for a retrofit application, the covering 10 can also be provided with new or uninstalled ceiling grid systems to provide the consumer greater color options. For example, a new ceiling grid system could be sold in a standard color, such as white, then the consumer could select a covering 10 for the grid system in a color suitable for its installed environment.

[0050]FIGS. 6 and 7 illustrate second and third embodiments of the invention, respectively wherein like reference numerals refer to like elements. The covering 10 in FIG. 6 includes a non-planar central web portion 48 two edges and a middle portion 50. FIGS. 6 and 7 show the non-planar web portion 48 as being upwardly rounded, domed or arched. Alternatively, the web portion 48 could be downwardly arched. In the second embodiment shown in FIG. 6, the covering 10 has a flange 14, preferably integral with one edge. The flange 14 cooperates with the web portion 12 to define a channel 18. The channel 18 is configured so as to house a portion of a main runner or a cross-tee as explained above. The flange 14 has a length that extends inwardly over the web portion 48. The covering 10 can function without a lip 16 due to the non-planar design of the web portion 12, and is particularly suited for the edge of a ceiling installation where the ceiling abuts a wall.

[0051]FIG. 7 illustrates a third embodiment of the covering 10. The covering 10 of the third embodiment has an upwardly arched, non-planar web portion 48 having two edges and a flange 14 preferably integral with one edge. The web portion 12 of the third embodiment also includes a lip 16 preferably integral with the other edge. The lip 16 cooperates with the web portion to define a channel 20, similar to the channel 18 defined by the flange 14. The channel 20 is configured so as to house a portion of a main runner or a cross-tee as explained above. The flange 14 and the lip 16 have lengths that extend inwardly over the web portion 12 and toward each other, with such lengths being unequal.

[0052] The web portion 48 shown in FIGS. 6 and 7 is unitary. Alternatively, the web portion 48 could comprise two resilient segments connected or attached at a middle portion 50 in a pitched fashion. These two pitched, connected segments may be biased towards one another. When pressure is applied to the middle portion, i.e. where the two segments connect, the edges move away from each other. Accordingly, when pressure is released from the middle portion 50, the two inwardly biased segments move toward one another, back to their biased original position. The non-planar web portions 48 enhance the ease in which the coverings 10 can be installed.

[0053] The non-planar web portions 48 of the second and third embodiments shown in FIGS. 6 and 7 improve ease of installation of the covering 10. The arch of the web portion 48 allows an installer to simply slide his/her thumb down the middle portion 50 of the arched web portion 48 to force the outer edges of the covering to expand away from one another. In the case of the second embodiment, the expansion allows the covering 10 to snap around the runner, and for the flange 14 to secure the covering 10 in place. Once pressure is removed from the middle portion 50, the web portion 48 tends to return to its non-planar position, i.e., the outer edges tend to move towards one another, thereby further securing the covering 10 in the installed position.

[0054] When pressure is applied to the middle portion 50 of the third embodiment of the covering 10, the outer edges expand away from one another such that both the flange 14 and the lip 16 expand and snap around the runner 29. When pressure is removed, the outer edges tend to move towards one another to their biased, resting position, thereby gripping the runner 24. In its installed position, the covering 10 is securely but removably positioned on the runner 24 by the flange 14 and the lip 16.

[0055]FIG. 8 illustrates an alternative embodiment of the invention, wherein like reference numerals refer to like elements. The covering 10 in FIG. 8 (a portion of which is shown in FIG. 12) of the alternative embodiment has an upwardly arched, non-planar web portion 48 having two ends 54, 58, two edges, a width and a length L as well as a flange 14 preferably integral with one edge. A lip 16 cooperates with the web portion to define a channel 20, similar to the channel 18 defined by the flange 14. The channel 20 is configured so as to house a portion of a main runner or a cross-tee as explained above. The flange 14 and lip 16 have lengths that extend inwardly over the web portion 12 and toward each other.

[0056] More particularly, the flange 14 has a first portion 40 having a first length L1 and a second portion 42 having a second length L2 (as better shown in FIGS. 9). The lip 16 has a first portion 44 having a third length L3 and a second portion 46 having a fourth length dimension L4. The length dimension LI and L3 of the portions 40 and 44, respectively, are preferably equal so as to accommodate the typically uniform height dimension of the edges 34 and 36 of the runner 24. However, and as noted above, the length dimension L2 and L4 of the portions 42 and 46, respectively, are preferably not equal. This is to enable the releasable snap fit action of the covering 10 onto the runner 24.

[0057] Most conventional, existing grid systems comprise a series of runners and cross-tees arranged perpendicular to one another in order to form a series of four-sided figures. For example, existing and conventional systems may comprise two-by-two foot squares or two-by-four foot rectangles, although a wide variety of other dimensions are possible. When used with systems comprising two-by-two foot squares or two-by-four foot rectangles, the covering 10 shown in FIG. 8 and 12 is most preferably about four feet in length. When used in other systems, the length of the covering 10 can vary greatly depending upon the size of the ceiling-grid system to which the covering is attached.

[0058] The covering 10 of FIG. 8 has a series of notches defined therein. More particularly, the flange 14 has a first notch 62 defined therein at a location about one-quarter of the length of the web portion 48 from the first end 54 of the web portion 48. The flange 14 also has a second notch 66 defined therein about one-quarter of the length of the web portion from the second end 58. The lip 18 has similar notches defined therein that correspond to the notches defined in the flange 14 on the other side of the web portion 12. More particularly, the lip 18 has a third notch 70 defined therein about one-quarter of the length of the web portion 48 from the first end 54 and a fourth notch 74 defined therein about one-quarter in from the second end 58 of the web portion 48. In other words, if the length of the covering 10 is about four feet, then the first and third notches 62, 70 are positioned about one foot in from the first end 54 and the second and fourth notches 66, 74 are positioned about one foot in from the second end 58 of the web portion 48. This leaves about two feet between the notches 62 and 66 and two feet between the notches 70 and 74. This arrangement of notches allows the covering 10 to be compatible with both two-by-two foot systems (as shown in FIG. 10) and two-by-four foot systems (as shown in FIG. 11), as either a covering for a runner or a cross-tee running perpendicular thereto. Furthermore, positioning the notches one-quarter of the length of the covering 10 from the ends allows a covering 10 to be used in any grid system defining squares or rectangles (particularly in an x-length by ½ x-length arrangement). FIG. 10 shows how the coverings 10 abut one another and can be staggered from one runner to the next.

[0059] Generally, the width of each notch is greater than the width of the runners and cross-tees in order to allow for the runners and cross-tees to fit therein. In other words, when the covering 10 of FIG. 8 is installed, one intersection of a runner and cross-tee fits into the first and third notches 62, 70 and another intersection of the same runner and another cross-tee fits into the second and fourth notches 66, 74. By abutting the coverings 10 of FIG. 8 with other similar coverings 10, the runners and the intersection of the runners and cross-tees are covered by the decorative coverings 10 without any gaps.

[0060] As part of the covering system, second coverings 78 (such as those shown in FIGS. 1-7) can be installed to cover the cross-tees running perpendicular to the runners covered by covering 10 (discussed in previous paragraph). In other words, the coverings 10 and the second coverings 78 may run perpendicular to one another. Depending on the ceiling grid system, the second covering 78 is usually one-half the length of the covering 10 less the width thereof, or the same length of the covering 10 less the width thereof. In other words, for use in a two-by-two foot square grid system (FIG. 10) wherein the width of the runners and cross-tees are about one inch, the covering 10 may be about 4 feet long and about one-inch wide. Accordingly, the second coverings 78 may be about 23 inches and about one-inch wide (or a convenient portion thereof). For use in a two-by-four foot grid system (FIG. 11) wherein the width of the runners and cross-tees are about one inch, the covering 10 may be about four feet long and about one inch wide. Accordingly, the second coverings 78 may be about 47 inches in length and one inch wide. Again, it is extremely important to note that the length of the covering 10 shown in FIG. 8 as well as the lengths of the second coverings 78 are dictated by the dimensions of the grid system. In other words, the length of the coverings can vary considerably and can be adapted by one of ordinary skill in the art to accommodate grid systems having different dimensions. It is also important to note that the notch arrangement in covering 10 of FIG. 8 allows for most conventional grid systems, i.e. two-by-two foot and two-by-four foot systems, to be covered using a combination of only three piece: a covering 10 and two different lengths of second covering 78. Again, for two-by-two foot square systems, only four-foot coverings 10 and 23 inch coverings 78 are required. For two-by-four foot square systems, only four-foot coverings 10 and 47 inch coverings 78 are required.

[0061] As shown in FIG. 13, the web portion 48 of the alternative embodiment covering 10 may also be planar. Such a covering is similar to the covering shown in FIGS. 1 and 3-5, except for the positioning of the notches as discussed above. Also, the covering 10 of the alternative embodiment may also simply include a flange 14 and not a lip 18 (as shown in FIG. 14). In other words, the covering 10 may only include a flange having first and second notches 62, 66 defined therein in the same manner as described above with regard to FIG. 8. 

I claim:
 1. A suspended-ceiling-grid system comprising: a plurality of runners oriented perpendicular to one another, each of said runners having a bottom member that will be visible to a room's occupant when the suspended ceiling grid system is installed, said bottom member being generally planar and having a first edge, a second edge and a width; a first covering comprising a web portion having a first edge, a second edge, a first end, a second end, a length L and a width, a flange having a first portion defined by a first length L1 and a second portion defined by a second length L2, said first portion of said flange connected to said first edge of said web portion, said second portion of said flange connected to said first portion of said flange, said second portion of said flange being generally parallel with said web portion and extending in the direction of said second edge of said web portion, said flange and said web portion cooperating to define a first channel, wherein the first channel is capable of receiving the first edge of a runner, the flange having a first notch defined therein at a location about one-quarter of the length L from the first end of the web portion and a second notch defined therein about one-quarter of the length L from the second end of the web portion; and a second covering having a length equal to either the length L of the web portion of the first covering less the width thereof or half the length of the web portion less the width thereof.
 2. The suspended-ceiling-grid system of claim 1, wherein at least one of the notches has a width, and the width is greater than the width of the runner.
 3. The suspended-ceiling-grid system of claim 1, wherein the first covering further comprises a lip having a first portion defined by a third length L3 and a second portion defined by a fourth length L4, said first portion of said lip connected to said second edge of said web portion, said second portion of said lip connected to said first portion of said lip, said second portion of said lip being generally parallel with said web portion and extending in the direction of said first edge of said web portion, said lip and said web portion cooperating to define a second channel, wherein the second channel is capable of being snapped over the second edge of the runner after the first channel has received the first edge of the runner, the lip having a third notch defined therein about one-quarter of the length L from the first end of the web portion and a fourth notch defined therein about one-quarter from the second end of the web portion.
 4. The suspended-ceiling-grid system of claim 3, wherein the length L of the web portion is about 4 feet.
 5. The suspended-ceiling-grid system of claim 4, wherein the length of the second covering is about twenty-three inches.
 6. The suspended-ceiling-grid system of claim 4, wherein the length of the second covering is about forty-seven inches.
 7. The suspended-ceiling-grid system of claim 3 wherein said first and third lengths (L1 and L3) of said first portions of said flange and said lip, respectively, are equal and wherein said second length L2 of said second portion of said flange is greater than said fourth length L4 of said second portion of said lip.
 8. The suspended-ceiling-grid system of claim 1 wherein the web portion is non-planar.
 9. A decorative covering for a suspended ceiling grid system having a runner including a first edge, a second edge and a width, the covering comprising: a web portion having a first edge, a second edge, a first end, a second end, and a length L, a flange having a first portion defined by a first length L1 and a second portion defined by a second length L2, said first portion of said flange connected to said first edge of said web portion, said second portion of said flange connected to said first portion of said flange, said second portion of said flange being generally parallel with said web portion and extending in the direction of said second edge of said web portion, said flange and said web portion cooperating to define a first channel, wherein the first channel is capable of receiving the first edge of a runner, the flange having a first notch defined therein about one-quarter of the length L from the first end of the web portion and a second notch defined therein about one-quarter of the length L from the second end of the web portion.
 10. The covering of claim 9, wherein at least one of the notches has a width greater than the width of the runner.
 11. The covering of claim 9, further comprising a lip having a first portion defined by a third length L3 and a second portion defined by a fourth length L4, said first portion of said lip connected to said second edge of said web portion, said second portion of said lip connected to said first portion of said lip, said second portion of said lip being generally parallel with said web portion and extending in the direction of said first edge of said web portion, said lip and said web portion cooperating to define a second channel, wherein the second channel is capable of being snapped over the second edge of the runner after the first channel has received the first edge of the runner, the lip having a third notch defined therein about one-quarter of the length L from the first end of the web portion and a fourth notch defined therein about one-quarter from the second end of the web portion.
 12. The covering of claim 11, wherein at least one notch has a width greater than the width of the runner.
 13. The covering of claim 11, wherein said first and third lengths (L1 and L3) of said first portions of said flange and said lip respectively are equal and wherein said second length L2 of said second portion of said flange is greater than said fourth length L4 of said second portion of said lip.
 14. The covering of claim 13, wherein the length L of the web portion is about four feet.
 15. The covering of claim 13, wherein the web portion is non-planar.
 16. A suspended-ceiling-grid system comprising: a plurality of runners oriented perpendicular to one another, each of said runners having a bottom member that will be visible to a room's occupant when the suspended ceiling grid system is installed, said bottom member being generally planar and having a first edge, a second edge and a width; a first covering comprising a web portion having a first edge, a second edge, a first end, a second end, and a length L, a flange having a first portion defined by a first length L1 and a second portion defined by a second length L2, said first portion of said flange connected to said first edge of said web portion, said second portion of said flange connected to said first portion of said flange, said second portion of said flange being generally parallel with said web portion and extending in the direction of said second edge of said web portion, said flange and said web portion cooperating to define a first channel, wherein the first channel is capable of receiving the first edge of a runner, and a lip having a first portion defined by a third length L3 and a second portion defined by a fourth length L4, said first portion of said lip connected to said second edge of said web portion, said second portion of said lip connected to said first portion of said lip, said second portion of said lip being generally parallel with said web portion and extending in the direction of said first edge of said web portion, said lip and said web portion cooperating to define a second channel, wherein the second channel is capable of being snapped over the second edge of the runner after the first channel has received the first edge of the runner, the first covering being about four feet in length and having first and third notches defined in the flange and lip, respectively, about one-foot in from the first end of the web portion and second and fourth notches defined in the flange and lip, respectively, about one-foot in from the second end of the web portion; and a second covering.
 17. The suspended-ceiling-grid system of claim 16, wherein the second covering has a length and the length is either about twenty-three inches or about forty-seven inches.
 18. The suspended-ceiling-grid system of claim 16, wherein the web portion of the first covering is non-planar.
 19. The suspended-ceiling-grid system of claim 16, wherein said first and third lengths of said first portions of said flange and said lip respectively are equal and wherein said second length of said second portion of said flange is greater than said fourth length of said second portion of said lip.
 20. The suspended-ceiling-grid system of claim 15, wherein the second covering has no notches defined therein. 